2022 Volume 78 Issue 2 Pages 60-71
In this study, the effects of curing temperature and curing time on the unconfined compressive strength of cement-stabilized soil were investigated in a laboratory test. A simple method was proposed for curing cement-stabilized soil at temperatures of 80°C‒100°C for construction sites using a retrofitted commercial pressure cooker. The analysis was conducted using cement-stabilized soil samples containing various amounts of fines and cement to obtain fairly low scatter with a strength ratio within ±0.1 in magnitude. The strength ratio defined as the unconfined compressive strength of cement-stabilized soil specimens cured at 100°C for one day against those cured in water at room temperature for 28 days. Next, a prediction method including a series of procedures such as soil sampling, specimen manufacturing, curing and unconfined compression testing was proposed to estimate the 28-day strength of cement-stabilized soil at construction sites using the strength ratio. To investigate the accuracy of the proposed prediction method, in-situ tests were conducted to improve the ground at field sites composed of sandy soil and volcanic cohesive soil.
